Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a04c83984a8816b…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 17:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f8158b9858b814529b164f9351fc49f SHA-1: 9a616038408d85dab891ffa747831da7d00def21 SHA-256: 3a04c83984a8816bdda9fabf7dc978b96df7625407395e84837f540731b2d08c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms designed to obscure malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dj-venci.com/uploads/pages/files/68367847535.pdf In PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/wigakis.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/supebi.pdfIn PDF document text
    • http://special-pharma.com/upload/files/vipuw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caa14f12e---vulakav.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/sidonurufo.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/fajurojefow.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/63455945780.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/fanowudumari.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/97614750378.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/41933702695.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021919132293063.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/lorasuzewirafilatutida.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/33952779704.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/girebizug.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/15261070392.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fozuzemulurum.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/xares.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/87223958441.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/36757361291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+tv+best+browserPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 10308 bytes
SHA-256: 4735d0fde85c6f53a94ffbe36c3d64ef18f3ee08d76ffa9a9e6148aaf68b88be
font_02_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16380 bytes
SHA-256: 2636bff56ee5fbbd5c66fde168352e9494721b5af2c347d6b9bf0fd94a2ae37f

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